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  OpenMV配置
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  <h1 id="相机参数设置"><a href="#相机参数设置" class="headerlink" title="相机参数设置"></a>相机参数设置</h1><p>感光元件使用时必须要用其对应模块 <em>sensor</em></p>
<h2 id="首先是参数设置"><a href="#首先是参数设置" class="headerlink" title="首先是参数设置"></a>首先是参数设置</h2><p>使用之前一些基本的信息是要被知晓的</p>
<h3 id="实例"><a href="#实例" class="headerlink" title="实例"></a>实例</h3><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> sensor</span><br><span class="line"></span><br><span class="line"><span class="comment"># init device</span></span><br><span class="line">sensor.reset()</span><br><span class="line"></span><br><span class="line"><span class="comment"># 输出属性设置</span></span><br><span class="line">sensor.set_pixformat(sensor.RGB565)  <span class="comment"># 设置为彩色</span></span><br><span class="line">sensor.set_framesize(sensor.QVGA)  <span class="comment"># 设置图像的大小</span></span><br><span class="line">sensor.skip_frames()  <span class="comment"># 跳过n张照片，在更改设置后，跳过一些帧，等待感光元件变稳定</span></span><br></pre></td></tr></table></figure>

<ul>
<li>以上代码暂时还为经过测试, 暂时省略用法标注</li>
</ul>
<h3 id="详解"><a href="#详解" class="headerlink" title="详解"></a>详解</h3><h4 id="色位深度设置"><a href="#色位深度设置" class="headerlink" title="色位深度设置"></a>色位深度设置</h4><details>
<summary>sensor.set_pixformat() 设置像素模式。</summary>

<p>sensor.GRAYSCALE: 灰度，每个像素8bit。</p>
<p>sensor.RGB565: 彩色，每个像素16bit。</p>
</details>

<h4 id="图像大小设置"><a href="#图像大小设置" class="headerlink" title="图像大小设置"></a>图像大小设置</h4><details>
<summary>sensor.set_framesize() 设置图像的大小</summary>

<p>sensor.QQCIF: 88x72</p>
<p>sensor.QCIF: 176x144</p>
<p>sensor.CIF: 352x288</p>
<p>sensor.QQSIF: 88x60</p>
<p>sensor.QSIF: 176x120</p>
<p>sensor.SIF: 352x240</p>
<p>sensor.QQQQVGA: 40x30</p>
<p>sensor.QQQVGA: 80x60</p>
<p>sensor.QQVGA: 160x120</p>
<p>sensor.QVGA: 320x240</p>
<p>sensor.VGA: 640x480</p>
<p>sensor.HQQQVGA: 80x40</p>
<p>sensor.HQQVGA: 160x80</p>
<p>sensor.HQVGA: 240x160</p>
<p>sensor.B64X32: 64x32 (用于帧差异 image.find_displacement())</p>
<p>sensor.B64X64: 64x64 用于帧差异 image.find_displacement())</p>
<p>sensor.B128X64: 128x64 (用于帧差异 image.find_displacement())</p>
<p>sensor.B128X128: 128x128 (用于帧差异 image.find_displacement())</p>
<p>sensor.LCD: 128x160 (用于LCD扩展板)</p>
<p>sensor.QQVGA2: 128x160 (用于LCD扩展板)</p>
<p>sensor.WVGA: 720x480 (用于 MT9V034)</p>
<p>sensor.WVGA2:752x480 (用于 MT9V034)</p>
<p>sensor.SVGA: 800x600 (仅用于 OV5640 感光元件)</p>
<p>sensor.XGA: 1024x768 (仅用于 OV5640 感光元件)</p>
<p>sensor.SXGA: 1280x1024 (仅用于 OV5640 感光元件)</p>
<p>sensor.UXGA: 1600x1200 (仅用于 OV5640 感光元件)</p>
<p>sensor.HD: 1280x720 (仅用于 OV5640 感光元件)</p>
<p>sensor.FHD: 1920x1080 (仅用于 OV5640 感光元件)</p>
<p>sensor.QHD: 2560x1440 (仅用于 OV5640 感光元件)</p>
<p>sensor.QXGA: 2048x1536 (仅用于 OV5640 感光元件)</p>
<p>sensor.WQXGA: 2560x1600 (仅用于 OV5640 感光元件)</p>
<p>sensor.WQXGA2: 2592x1944 (仅用于 OV5640 感光元件)</p>
</details>

<h4 id="跳过一些帧"><a href="#跳过一些帧" class="headerlink" title="跳过一些帧"></a>跳过一些帧</h4><ul>
<li><p>sensor.skip_frames(n&#x3D;10)</p>
<p>  跳过n张照片，在更改设置后，跳过一些帧，等待感光元件变稳定。</p>
</li>
</ul>
<h4 id="摄像参数设置"><a href="#摄像参数设置" class="headerlink" title="摄像参数设置"></a>摄像参数设置</h4><ul>
<li><p>sensor.set_auto_gain()</p>
<p>  自动增益开启（True）或者关闭（False）。在使用颜色追踪时，需要关闭自动增益。</p>
</li>
<li><p>sensor.set_auto_whitebal()</p>
<p>  自动白平衡开启（True）或者关闭（False）。在使用颜色追踪时，需要关闭自动白平衡。</p>
</li>
<li><p>sensor.set_auto_exposure(enable[, exposure_us])</p>
<p>  enable 打开（True）或关闭（False）自动曝光。默认打开。<br>  如果 enable 为False， 则可以用 exposure_us 设置一个固定的曝光时间（以微秒为单位）。</p>
</li>
</ul>
<h4 id="设置窗口ROI"><a href="#设置窗口ROI" class="headerlink" title="设置窗口ROI"></a>设置窗口ROI</h4><p>ROI行话缩写, Range Of Interesting</p>
<p>图像处理中的术语“感兴趣区”。就是在要处理的图像中提取出的要处理的区域。</p>
<ul>
<li><p>sensor.set_windowing(roi)</p>
<p>  其中roi对象是一个4元素数组(x, y, w, h)</p>
</li>
</ul>
<h4 id="设置反转"><a href="#设置反转" class="headerlink" title="设置反转"></a>设置反转</h4><ul>
<li><p>sensor.set_hmirror(bool)</p>
<p>  水平镜像</p>
</li>
<li><p>sensor.set_vflip(bool)</p>
<p>  垂直翻转</p>
</li>
</ul>
<h2 id="测试图像"><a href="#测试图像" class="headerlink" title="测试图像"></a>测试图像</h2><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sensor.snapshot()</span><br></pre></td></tr></table></figure>

<p>直接以当前设置进行单张拍摄, 该方法将返回一个image对象</p>
 
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</style>
    
    

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